US 4,394,832 AGranted

Brake booster for automotive vehicles

AssigneeITT Industries, Inc.

InventorsRolf Weiler, Peter Boehm

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Abstract

A brake booster for automotive vehicles comprises a low-pressure casing which is sealingly subdivided into a low pressure chamber and a working chamber by an axially movable wall. Axially movable wall includes a flexible diaphragm abutting a diaphragm plate. The diaphragm plate extends with radial ribs through wide longitudinal slots of a central reinforcement tube of the low-pressure casing and transmits the boosting force from the diaphragm plate to a centrally located control valve housing. A sliding element axially slidable together with the movable wall is guided at the axially extending rims of each of the longitudinal slots and overlaps the rims of the associated one of the longitudinal slots adjacent the working chamber. A rolling diaphragm of the movable wall disposed between the diaphragm plate and the reinforcement tube, rolls over the sliding element upon the boosting force movement, the sliding element bridging the longitudinal slot at this point.

Claims14

Dependent claims

A brake booster for automotive vehicles comprising:

a low-pressure casing sealingly subdivided into a low-pressure chamber and a working chamber by an axially movable wall;
a reinforcement tube extending axially through said casing having its ends fastened to the end walls of said casing and sealed to said movable wall by a rolling diaphragm;
a mechanically actuated control valve to connect said working chamber with a selected one of said low-pressure chamber and atmosphere, said control valve having a housing axially movable within said tube and connected to said movable wall by ribs extending radially through longitudinal slots disposed in said tube, said rolling diaphragm rolling over at least a portion of said slots adjacent said working chamber;
and
a sliding element engaging and axially guided by axially extending rims of each of said slots, said elements having means distinct from said wall to axially displace said elements together with said wall and each of said elements having a covering bead which overlaps said portion of said slots between said slots and said rolling diaphragm.

2 more elements

Dependencies are inferred from the claim text.